By the way, I think it's totally cool that you're only 14 yrs old and already becoming a rifle nut. Puts a smile on my face.
I think the first and most important question to answer honestly to yourself is "what am I going to use the rifle for ?". Sounds easy enough, but sometimes it's not that easy to do. This is really the basis for all of the decisions about your gun.
Answer that accurately and now you're in business. From that you can figure out where to go in terms of power vs. barrel life. How much versatility do you need. Acceptable level of accuracy. How much and what kind of brass do you need. Bullet style and required twist for the bbl. Action style and overall rig setup. Stock. On and on.
I totally understand the dilemma - lots of good choices nowadays.
Built a 6.5-'06 AI a number of years back b/c my buddy had the reamer, and you couldn't get 6.5-.284 brass from Lapua at the time. I had an eye towards getting strong, high quality brass with a lot of power/performance for hunting. The Creedmoor didn't even exist and isn't at the performance level I wanted. The .260 Rem AI was an option using Lapua .243 brass, but it didn't quite have the performance I was looking for either. The improved '06 was great b/c I could form Lapua brass and get almost .264 WinMag performance. My buddy was consistently winning 1,000 yd relays with his, so I knew the accuracy potential. As a hunting gun, it would have acceptable bbl life for me - most say around 900 to 1,200 rds depending on how you use it. Only downside is the case forming tends to be a serious pain, especially since the reamer was a tight neck, so I have to turn necks on top of all the other case forming operations. Added expense of extra tools. Don't be afraid of wildcats - there's plenty of guys to guide you here, but you need to decide if all the extra work is really worth the potential gain.
Nowadays, if I did it again, for what I was looking for, I'd just get Lapua brass in a straight 6.5-.284, chambered for a no-turn neck and be done with it. And actually, I might even step up to 7mm and go with a .280 AI. Great bbl life from what I've heard. You can get Nosler brass already formed. The 7mm bullets are hard to beat in terms of lots of choices, excellent quality, high b.c. The 7's give a lot of power for the limited amount of recoil they tend to generate. Plus I think they are generally easier to tune for accuracy than the 6.5's in the upper level of the performance spectrum. No experience to say when it comes to the sensible 6.5's like the the .260 Rem, Creedmoor, 6.5x47 Lapua, 6.5x55 Swede which, by the way, is another great choice if you're dead-set on the 6.5 - relatively cheap high quality Lapua brass that's about 1/2 the price of the others already mentioned - guess since it's Europe's .308 win, they make a LOT of it, so quantity keeps it cheaper - only downside is that the Lapua brand case rim is made exactly to spec and is about .008" to .011" larger than the U.S. made stuff, so it might be tight in some bolt faces (some custom actions and a Kimber 84M I spec'd out one time).
To muddy the water even a little more for you, if you are considering a 7mm, check out the 7WSM as well, but you'll need a magnum size bolt-face. All the others above go with the standard .473" size.
Hope this was helpful, though I probably now took you back to square one - but like I said, that's where you need to answer that all-important first question.